Initial commit: PriceGhost price tracking application

Full-stack application for tracking product prices:
- Backend: Node.js + Express + TypeScript
- Frontend: React + Vite + TypeScript
- Database: PostgreSQL
- Price scraping with Cheerio
- JWT authentication
- Background price checking with node-cron
- Price history charts with Recharts
- Docker support with docker-compose

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docker-compose.yml

@@ -0,0 +1,54 @@
+version: '3.8'
+
+services:
+  # PostgreSQL Database
+  postgres:
+    image: postgres:16-alpine
+    container_name: priceghost-db
+    environment:
+      POSTGRES_USER: postgres
+      POSTGRES_PASSWORD: postgres
+      POSTGRES_DB: priceghost
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    ports:
+      - "5432:5432"
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U postgres"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+    restart: unless-stopped
+
+  # Backend API
+  backend:
+    build:
+      context: ./backend
+      dockerfile: Dockerfile
+    container_name: priceghost-backend
+    environment:
+      DATABASE_URL: postgresql://postgres:postgres@postgres:5432/priceghost
+      JWT_SECRET: ${JWT_SECRET:-change-this-in-production-use-strong-secret}
+      PORT: 3001
+      NODE_ENV: production
+    ports:
+      - "3001:3001"
+    depends_on:
+      postgres:
+        condition: service_healthy
+    restart: unless-stopped
+
+  # Frontend
+  frontend:
+    build:
+      context: ./frontend
+      dockerfile: Dockerfile
+    container_name: priceghost-frontend
+    ports:
+      - "80:80"
+    depends_on:
+      - backend
+    restart: unless-stopped
+
+volumes:
+  postgres_data: